We stayed on Caye Caulker in March of last year and we loved it. It is alot quieter than Ambergris so it depends on what you are looking for (we had stayed on Ambergris several years ago; it is even more developed now). As far as diving goes, you pretty much go to the same dive sites from both islands.
The best diving we did was out on Turneffe atolls. As others said it is a long boat ride but you do 3 tanks and it includes lunch. Unfortunately, when we went out it was rough seas and a nice, long bumpy ride. Hopefully you'll have it better.
I definitely recommend going out to the atolls if you can. Some of the best diving is out there, IMO. We didn't get to the Blue Hole since no operator was going out while we were there - not enough people signed up. Of course, they went the day we left. Guess we just have to go back.
Enjoy!
The best diving we did was out on Turneffe atolls. As others said it is a long boat ride but you do 3 tanks and it includes lunch. Unfortunately, when we went out it was rough seas and a nice, long bumpy ride. Hopefully you'll have it better.
I definitely recommend going out to the atolls if you can. Some of the best diving is out there, IMO. We didn't get to the Blue Hole since no operator was going out while we were there - not enough people signed up. Of course, they went the day we left. Guess we just have to go back.
Enjoy!